feat: Add option to set instance_type on the launch template

examples/eks_managed_node_group/main.tf

@@ -182,6 +182,12 @@ module "eks" {
       instance_types = ["t4g.medium"]
     }
 
+    # Set the instance type in the launch template
+    lt_instance_type = {
+      instance_type  = "t3.medium"
+      instance_types = null # Reset the value from eks_managed_node_group_defaults to prevent conflict.
+    }
+
     # Complete
     complete = {
       name            = "complete-eks-mng"
@@ -269,17 +275,17 @@ module "eks" {
           min_size     = 2
           max_size     = "-1" # Retains current max size
           desired_size = 2
-          start_time   = "2023-03-05T00:00:00Z"
-          end_time     = "2024-03-05T00:00:00Z"
+          start_time   = "2024-03-05T00:00:00Z"
+          end_time     = "2025-03-05T00:00:00Z"
           timezone     = "Etc/GMT+0"
           recurrence   = "0 0 * * *"
         },
         scale-down = {
           min_size     = 0
           max_size     = "-1" # Retains current max size
           desired_size = 0
-          start_time   = "2023-03-05T12:00:00Z"
-          end_time     = "2024-03-05T12:00:00Z"
+          start_time   = "2024-03-05T12:00:00Z"
+          end_time     = "2025-03-05T12:00:00Z"
           timezone     = "Etc/GMT+0"
           recurrence   = "0 12 * * *"
         }

modules/eks-managed-node-group/README.md

@@ -136,7 +136,8 @@ module "eks_managed_node_group" {
 | <a name="input_iam_role_tags"></a> [iam\_role\_tags](#input\_iam\_role\_tags) | A map of additional tags to add to the IAM role created | `map(string)` | `{}` | no |
 | <a name="input_iam_role_use_name_prefix"></a> [iam\_role\_use\_name\_prefix](#input\_iam\_role\_use\_name\_prefix) | Determines whether the IAM role name (`iam_role_name`) is used as a prefix | `bool` | `true` | no |
 | <a name="input_instance_market_options"></a> [instance\_market\_options](#input\_instance\_market\_options) | The market (purchasing) option for the instance | `any` | `{}` | no |
-| <a name="input_instance_types"></a> [instance\_types](#input\_instance\_types) | Set of instance types associated with the EKS Node Group. Defaults to `["t3.medium"]` | `list(string)` | `null` | no |
+| <a name="input_instance_type"></a> [instance\_type](#input\_instance\_type) | Set of instance type associated with the Launch Template. Conflicts with `instance_types` | `string` | `null` | no |
+| <a name="input_instance_types"></a> [instance\_types](#input\_instance\_types) | Set of instance types associated with the EKS Node Group. Defaults to `["t3.medium"]`. Conflicts with `instance_types` | `list(string)` | `null` | no |
 | <a name="input_kernel_id"></a> [kernel\_id](#input\_kernel\_id) | The kernel ID | `string` | `null` | no |
 | <a name="input_key_name"></a> [key\_name](#input\_key\_name) | The key name that should be used for the instance(s) | `string` | `null` | no |
 | <a name="input_labels"></a> [labels](#input\_labels) | Key-value map of Kubernetes labels. Only labels that are applied with the EKS API are managed by this argument. Other Kubernetes labels applied to the EKS Node Group will not be managed | `map(string)` | `null` | no |

modules/eks-managed-node-group/main.tf

@@ -170,6 +170,8 @@ resource "aws_launch_template" "this" {
     }
   }
 
+  instance_type = var.instance_type
+
   # # Set on node group instead
   # instance_type = var.launch_template_instance_type
   kernel_id = var.kernel_id

modules/eks-managed-node-group/variables.tf

@@ -222,6 +222,12 @@ variable "instance_market_options" {
   default     = {}
 }
 
+variable "instance_type" {
+  description = "Set of instance type associated with the Launch Template. Conflicts with `instance_types`"
+  type        = string
+  default     = null
+}
+
 variable "maintenance_options" {
   description = "The maintenance options for the instance"
   type        = any
@@ -351,7 +357,7 @@ variable "force_update_version" {
 }
 
 variable "instance_types" {
-  description = "Set of instance types associated with the EKS Node Group. Defaults to `[\"t3.medium\"]`"
+  description = "Set of instance types associated with the EKS Node Group. Defaults to `[\"t3.medium\"]`. Conflicts with `instance_types`"
   type        = list(string)
   default     = null
 }

node_groups.tf

@@ -341,6 +341,7 @@ module "eks_managed_node_group" {
   elastic_inference_accelerator      = try(each.value.elastic_inference_accelerator, var.eks_managed_node_group_defaults.elastic_inference_accelerator, {})
   enclave_options                    = try(each.value.enclave_options, var.eks_managed_node_group_defaults.enclave_options, {})
   instance_market_options            = try(each.value.instance_market_options, var.eks_managed_node_group_defaults.instance_market_options, {})
+  instance_type                      = try(each.value.instance_type, var.eks_managed_node_group_defaults.instance_type, null)
   license_specifications             = try(each.value.license_specifications, var.eks_managed_node_group_defaults.license_specifications, {})
   metadata_options                   = try(each.value.metadata_options, var.eks_managed_node_group_defaults.metadata_options, local.metadata_options)
   enable_monitoring                  = try(each.value.enable_monitoring, var.eks_managed_node_group_defaults.enable_monitoring, true)